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Piled foundation with block and beam floor

Discussion in 'Building' started by acurachris, 13 Jun 2018.

  1. acurachris

    acurachris

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    Location:
    Manchester
    Country:
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    Hi

    It seems i'm trying for the record of the longest time taken to do an extension! I am hitting so many problems!

    After much advice & discussion with several structural engineers and the recommendation of the building officer, I am having the foundations for my two storey extension piled (even though two builders and one structural engineer said raft). I have the piling guy confirmed and he's getting the piling calcs/design done so I can dig the trenches. He has been really helpful although he only does the piling so whilst he has given me lots of info, I need to clarify a couple of things.

    He said that I should use a block and beam or suspended concrete floor and not a ground bearing slab. I can see the logic here; the ground isn't good enough, hence the piles, so the oversite isn't likely good enough to bear a slab!

    Is he correct in saying it needs a suspended floor and not to use a ground bearing slab?

    If i use block and beam with a 150mm air gap that means 300mm of ground needs digging out at the side of the house where the extension abuts, would this cause issues to the house?

    The beams sit on a DPC which is going to be 150-225mm below ground level, is that odd?

    Is the following diagram right or am i missing something?

    block beam text.jpg

    Cheers in advance!
     
  2. Notch7

    Notch7

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    Is he correct in saying it needs a suspended floor and not to use a ground bearing slab? Yes

    If i use block and beam with a 150mm air gap that means 300mm of ground needs digging out at the side of the house where the extension abuts, would this cause issues to the house? No

    The beams sit on a DPC which is going to be 150-225mm below ground level, is that odd? No need for dpc under beams AFAIK

    Is the following diagram right or am i missing something? Yes, its about right





    Read more: https://www.diynot.com/diy/threads/piled-foundation-with-block-and-beam-floor.504251/#ixzz5IKG3c3IS
     
  3. DIYnot Local

    DIYnot Local

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